import re

from django_redis import get_redis_connection
from rest_framework import serializers
from rest_framework_jwt.settings import api_settings

from .models import User


class RegisterSerializers(serializers.ModelSerializer):
    password2 = serializers.CharField(label='确认密码', write_only=True)
    sms_code = serializers.CharField(label='短信验证码', write_only=True)
    allow = serializers.CharField(label='同意协议', write_only=True)

    class Meta:
        model = User
        fields = ('id', 'username', 'password', 'password2', 'mobile', 'sms_code', 'allow')
        extra_kwargs = {
            'username': {
                'min_length': 5,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许5-20个字符的用户名',
                    'max_length': '仅允许5-20个字符的用户名',
                }
            },
            'password': {
                'write_only': True,
                'min_length': 8,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许8-20个字符的密码',
                    'max_length': '仅允许8-20个字符的密码',
                }
            }
        }

    def validate_mobile(self, value):
        if not re.match(r'1[345789]\d{9}$', value):
            raise serializers.ValidationError('手机格式错误')
        return value

    def validate_allow(self, value):
        if value != 'true':
            raise serializers.ValidationError('请同意协议')
        return value

    def validate(self, attrs):
        password = attrs['password']
        password2 = attrs['password2']
        sms_code = attrs['sms_code']
        mobile = attrs['mobile']
        if password != password2:
            raise serializers.ValidationError('两次密码不一致')

        redis_conn = get_redis_connection('verify_codes')
        old_sms_code = redis_conn.get('sms_%s' % mobile)
        old_sms_code=old_sms_code.decode()
        if not old_sms_code:
            raise serializers.ValidationError('无效的短信验证码')
        if sms_code != old_sms_code:
            raise serializers.ValidationError('短信验证码错误')
        return attrs

    def create(self, validated_data):
        del validated_data['password2']
        del validated_data['sms_code']
        del validated_data['allow']

        user = super().create(validated_data)

        # 调用django的认证系统加密密码
        user.set_password(validated_data['password'])
        user.save()
        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER

        payload = jwt_payload_handler(user)
        token = jwt_encode_handler(payload)
        user.token=token
        return user


